Close sockect on error in S1AP.

srsepc/src/mme/s1ap.cc

@@ -193,6 +193,7 @@ s1ap::enb_listen()
   evnts.sctp_data_io_event = 1;
   evnts.sctp_shutdown_event=1;
   if(setsockopt(sock_fd, IPPROTO_SCTP, SCTP_EVENTS, &evnts, sizeof (evnts))){
+    close(sock_fd);
     m_s1ap_log->console("Subscribing to sctp_data_io_events failed\n");
     return -1;
   }
@@ -204,6 +205,7 @@ s1ap::enb_listen()
   s1mme_addr.sin_port = htons(S1MME_PORT);
   err = bind(sock_fd, (struct sockaddr*) &s1mme_addr, sizeof (s1mme_addr));
   if (err != 0){
+    close(sock_fd);
     m_s1ap_log->error("Error binding SCTP socket\n");
     m_s1ap_log->console("Error binding SCTP socket\n");
     return -1;
@@ -212,6 +214,7 @@ s1ap::enb_listen()
   //Listen for connections
   err = listen(sock_fd,SOMAXCONN);
   if (err != 0){
+    close(sock_fd);
     m_s1ap_log->error("Error in SCTP socket listen\n");
     m_s1ap_log->console("Error in SCTP socket listen\n");
     return -1;